| Like
the J-5, the J-6 Whirlwind was based
on the J-4 of 1924, this time with cylinders of increased bore (from
4.5 to 5 inches).
The first J-6 (the Whirlwind 7) flew in 1925. In
1929, the Whirlwind 9 was introduced and in 1930, the Whirlwind
5. All three shared the same cylinder design (5 x 5.5 in);
they differed in the number of cylinders.
The Whirlwind 9 (R-975) was also produced by Continental during
World War II. |
|
Whirlwind
5 (R-540)
 |
5 cylinder, air-cooled, radial |
| displacement: 540 cubic inches (8.8 liters) |
Whirlwind
7 (R-760)
|
7 cylinder, air-cooled, radial |
| displacement: 757 cubic inches (12.4 liters) |
Whirlwind
9 (R-975)
|
9 cylinder, air-cooled, radial |
| displacement: 973 cubic inches (15.9 liters) |
|
